import {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';

import Stats from 'three/addons/libs/stats.module.js';
var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {

  let container, stats;
  let camera, scene, raycaster, renderer, parentTransform, sphereInter;

  const pointer = new THREE.Vector2();
  const radius = 100;
  let theta = 0;

  init();
  animate();

  function init() {

    container = document.createElement( 'div' );
    document.body.appendChild( container );

    const info = document.createElement( 'div' );
    info.style.position = 'absolute';
    info.style.top = '10px';
    info.style.width = '100%';
    info.style.textAlign = 'center';
    info.innerHTML = '<a href="https://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - interactive lines';
    container.appendChild( info );

    camera = new THREE.PerspectiveCamera( 70, window.innerWidth / window.innerHeight, 1, 10000 );

    scene = new THREE.Scene();
    scene.background = new THREE.Color( 0xf0f0f0 );

    const geometry = new THREE.SphereGeometry( 5 );
    const material = new THREE.MeshBasicMaterial( { color: 0xff0000 } );

    sphereInter = new THREE.Mesh( geometry, material );
    sphereInter.visible = false;
    scene.add( sphereInter );

    const lineGeometry = new THREE.BufferGeometry();
    const points = [];

    const point = new THREE.Vector3();
    const direction = new THREE.Vector3();

    for ( let i = 0; i < 50; i ++ ) {

      direction.x += Math.random() - 0.5;
      direction.y += Math.random() - 0.5;
      direction.z += Math.random() - 0.5;
      direction.normalize().multiplyScalar( 10 );

      point.add( direction );
      points.push( point.x, point.y, point.z );

    }

    lineGeometry.setAttribute( 'position', new THREE.Float32BufferAttribute( points, 3 ) );

    parentTransform = new THREE.Object3D();
    parentTransform.position.x = Math.random() * 40 - 20;
    parentTransform.position.y = Math.random() * 40 - 20;
    parentTransform.position.z = Math.random() * 40 - 20;

    parentTransform.rotation.x = Math.random() * 2 * Math.PI;
    parentTransform.rotation.y = Math.random() * 2 * Math.PI;
    parentTransform.rotation.z = Math.random() * 2 * Math.PI;

    parentTransform.scale.x = Math.random() + 0.5;
    parentTransform.scale.y = Math.random() + 0.5;
    parentTransform.scale.z = Math.random() + 0.5;

    for ( let i = 0; i < 50; i ++ ) {

      let object;

      const lineMaterial = new THREE.LineBasicMaterial( { color: Math.random() * 0xffffff } );

      if ( Math.random() > 0.5 ) {

        object = new THREE.Line( lineGeometry, lineMaterial );

      } else {

        object = new THREE.LineSegments( lineGeometry, lineMaterial );

      }

      object.position.x = Math.random() * 400 - 200;
      object.position.y = Math.random() * 400 - 200;
      object.position.z = Math.random() * 400 - 200;

      object.rotation.x = Math.random() * 2 * Math.PI;
      object.rotation.y = Math.random() * 2 * Math.PI;
      object.rotation.z = Math.random() * 2 * Math.PI;

      object.scale.x = Math.random() + 0.5;
      object.scale.y = Math.random() + 0.5;
      object.scale.z = Math.random() + 0.5;

      parentTransform.add( object );

    }

    scene.add( parentTransform );

    raycaster = new THREE.Raycaster();
    raycaster.params.Line.threshold = 3;

    renderer = new THREE.WebGLRenderer( { antialias: true } );
    renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( window.innerWidth, window.innerHeight );
    container.appendChild( renderer.domElement );

    stats = new Stats();
    container.appendChild( stats.dom );

    document.addEventListener( 'pointermove', onPointerMove );

    //

    window.addEventListener( 'resize', onWindowResize );

  }

  function onWindowResize() {

    camera.aspect = window.innerWidth / window.innerHeight;
    camera.updateProjectionMatrix();

    renderer.setSize( window.innerWidth, window.innerHeight );

  }

  function onPointerMove( event ) {

    pointer.x = ( event.clientX / window.innerWidth ) * 2 - 1;
    pointer.y = - ( event.clientY / window.innerHeight ) * 2 + 1;

  }

  //

  function animate() {

    requestId = requestAnimationFrame( animate );

    render();
    stats.update();

  }

  function render() {

    theta += 0.1;

    camera.position.x = radius * Math.sin( THREE.MathUtils.degToRad( theta ) );
    camera.position.y = radius * Math.sin( THREE.MathUtils.degToRad( theta ) );
    camera.position.z = radius * Math.cos( THREE.MathUtils.degToRad( theta ) );
    camera.lookAt( scene.position );

    camera.updateMatrixWorld();

    // find intersections

    raycaster.setFromCamera( pointer, camera );

    const intersects = raycaster.intersectObjects( parentTransform.children, true );

    if ( intersects.length > 0 ) {

      sphereInter.visible = true;
      sphereInter.position.copy( intersects[ 0 ].point );

    } else {

      sphereInter.visible = false;

    }

    renderer.render( scene, camera );

  }
  }
})